If the universe is only 14 billion years old, how can it be 92 billion light years wide?

The size and age of the universe seem to not agree with one another. Astronomers have determined that the universe is nearly 14 billion years old and yet its diameter is 92 billion light years across. How can both of those numbers possibly be true? In this video, Fermilab’s Dr. Don Lincoln tells you how.

For further information, see www.fnal.gov

Пікірлер: 28 103

  • Ed Vincent Calaguas
    Ed Vincent Calaguas

    So basically he is saying that we will never ever know how really big the universe is. It’s because we can’t see anything that is beyond 15Billion light years due to the expansion of universe is faster than the speed of light. The fact that we are loosing 20k stars per seconds on our line of sights speaks how fast the universe is expanding. This is very fascinating!

  • Michael Cohen
    Michael Cohen16 сағат бұрын

    Don, these vids are brilliant. Questions like this one have always bothered the hell out of me (like this one, or the apparent change in the speed of light through different transparent media). I was just resolved but not happy that answers would not be available 'cause it appeared I was the only one asking these questions. Take a bow man, this is a huge service to myself, and now I can say, all of nerd-kind. Much appreciation.

  • Sohel Ibrahim
    Sohel Ibrahim21 күн бұрын

    Some thought experiments:

  • freedomXforce
    freedomXforce28 күн бұрын

    Seems to me given the area the universe is encompasses today it would be very hard for it to be expanding slower than it did shortly after the big bang.

  • Alan F Brookes
    Alan F Brookes

    A simpler way to explain it is that, if something expands from a single point, its perimeter will be a continually-expanding sphere. In any sphere, the diameter is twice the distance from the centre, so you would expect the distance from any point to the centre to be a lot shorter than the diameter. The reason it's more than double is more complex.

  • bseddonmusic1
    bseddonmusic1

    If it takes time for parts of the universe to become visible from earth (as an example location not geocentrism - feel free to pick your own) and it's expanding so parts that can be seen in one instance will be unseeable in later instances, is there a time to live or have lived that it is possible to be able to see the most numbers of stars or galaxies?

  • gregg hillier
    gregg hillier Жыл бұрын

    if everybody leaves their toast in for 8 minutes....this could account for most of the dark matter in the universe

  • Rutger van Riemsdijk
    Rutger van Riemsdijk

    I always thought nothing is faster than the speed of light, but a what speed is the universe expanding?

  • Ralf Sxm
    Ralf Sxm

    The moment you realize that time does not exist, then ... everything is getting clear.

  • Rick Schofield
    Rick Schofield

    It’s fun to think that the stars you look at in a telescope may have become a supernova yesterday but we won’t know it for several thousand years

  • Al Woolhouse
    Al Woolhouse

    Explicación perfecta, gracias. Me he suscrito.

  • Christopher Milne
    Christopher Milne

    Would it be possible to make dark matter? If so, how would we do it?

  • Joshua Lee
    Joshua Lee Жыл бұрын

    Basically space is expanding so fast it’s decreasing our render distance

  • Denny Kitch
    Denny Kitch

    Another way to propose this question might be : How could anyone accurately know how old the universe is or how wide it is?

  • Mark Gardner
    Mark Gardner

    Although this will make some people's heads spin, it answered questions I had well. Even though there may not be any humans still around at that far away date, it is amazing that the skies will be less and less populated visually. I am sad for future beings who will look up at the night sky and mostly see darkness.

  • Michael Lonergan
    Michael Lonergan

    Mind blowing! Now if someone could only explain to me where the Moon goes when we can't see it at night? ;)

  • Sorin Panait
    Sorin Panait

    Everything explained very clear. Except that I was waiting to hear that the speed of light isn't actually the limit, since the speed of expansion of the universe is much bigger. I'm still waiting to hear that.

  • Clinton Reisig
    Clinton Reisig

    Every year, new discoveries of galaxies farthest from our own are made 👍

  • Nurpus
    Nurpus2 жыл бұрын

    I swear this man has a body language of a quest-giving NPC

  • Enrique Olivares
    Enrique Olivares

    Lincoln should make another video on this same topic explaining better such an important issue, he should reivindicate his level as one of the best science popularizer pound-for-pound